Hearing engine through CB radio... ideas?
#1
Hearing engine through CB radio... ideas?
This is probably child's play, but I noticed that I'm hearing engine noise (whine, changing pitch with RPMs) through my CB. At 80mph I'm squelching out most useful conversation. Do I have a bad ground, or do I have a coil going bad, (Maybe that would explain my rough idle?) or is it something else? Electrical gurus (cough*Griggs*cough) help me out here!
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Originally Posted by quest51210
what is it telling you?
reground to a factory ground and then let us know
reground to a factory ground and then let us know
I was hoping to avoid a few hours of diagnostic time wasted if someone with specific experience could relate their findings to me. Obviously I could do a bunch of work to isolate the problem.. but I've had so little free time lately I'm over 500miles overdue to change the oil, if thats any indication.
#11
Originally Posted by Wowak
I was hoping to avoid a few hours of diagnostic time wasted if someone with specific experience could relate their findings to me. Obviously I could do a bunch of work to isolate the problem.. but I've had so little free time lately I'm over 500miles overdue to change the oil, if thats any indication.
Well change ur damn oil. A healthy truck is a lot better than a f'd up one.
Aaron
#13
Originally Posted by Redneckstone
buy sheilded cable, fixed my buddy's problem
#14
Our trucks are an elecrical nightmare when it comes to elec noise. I got all sorts of hum on my one 2 way. I tryed eveything and never could get it to go away, like you it just started one day.
Check the wires and coax, make sure it did not wear through or chafe (SP) the shielding under the dash or under the hood.
Check the wires and coax, make sure it did not wear through or chafe (SP) the shielding under the dash or under the hood.
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Originally Posted by Wowak
Well, considering that for quite some time everything worked fine WITHOUT shielded cable, I sort of want to know what went bad before I start upgrading. I guess I'm old fashioned like that, I get more satisfaction out of fixing it than upgrading it. (Although I love when it can't be fixed, because THEN I get to upgrade!)
#19
Whining or whistling heard over the CB that changes with engine speed is generally caused by the alternator and a dirty or loose ground..
My solution was to remove and clean all the factgory ground connections that I could find along with installing about 8 more made up of 1/2" braded grounding strap with soldered connectors and copper conductive paste under the connector. The new grounds were attached between the bed and the cab, the bed and the frame, the cab and the frame and the exhaust system and the frame in 3 places....
The extra grounding help remove the whistling and increased the receive/transmit signals due to an increased ground plane provided by more of the truck body being used as the ground.
I run a ICOM 706 MK2G with a Sirio 7/8 wave antenna on a Wilson 5K mag mount using LMR 240 coax. When the SKIP is rolling.... I can talk to Florida, Oregon and even Australia at the end of the work day.....
OR 4x4
My solution was to remove and clean all the factgory ground connections that I could find along with installing about 8 more made up of 1/2" braded grounding strap with soldered connectors and copper conductive paste under the connector. The new grounds were attached between the bed and the cab, the bed and the frame, the cab and the frame and the exhaust system and the frame in 3 places....
The extra grounding help remove the whistling and increased the receive/transmit signals due to an increased ground plane provided by more of the truck body being used as the ground.
I run a ICOM 706 MK2G with a Sirio 7/8 wave antenna on a Wilson 5K mag mount using LMR 240 coax. When the SKIP is rolling.... I can talk to Florida, Oregon and even Australia at the end of the work day.....
OR 4x4
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There is no good 'loop isolater'. The best filtering to get is one that's like the following link...
http://cgi.ebay.com/Workman-Bandit-C...QQcmdZViewItem
BUt first...have you found out where the noise is coming in at? Pull the coax off the radio while the radio is on and the noise is presant. If the noise goes away....it's coming in through the antenna. Then you'd need an antenna noise filter. But....if the noise is still there...then it's coming through the power wire or ground wire. Ground wire should already be as short as possible. Same with the power. imo...i'd get power for the cb from a cigerette lighter or something inside the rig....no in the engine may. Routing of the coax makes a difference too....no looping it up to take away the excess.
http://cgi.ebay.com/Workman-Bandit-C...QQcmdZViewItem
BUt first...have you found out where the noise is coming in at? Pull the coax off the radio while the radio is on and the noise is presant. If the noise goes away....it's coming in through the antenna. Then you'd need an antenna noise filter. But....if the noise is still there...then it's coming through the power wire or ground wire. Ground wire should already be as short as possible. Same with the power. imo...i'd get power for the cb from a cigerette lighter or something inside the rig....no in the engine may. Routing of the coax makes a difference too....no looping it up to take away the excess.
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#25
There is no good 'loop isolater'. The best filtering to get is one that's like the following link...
http://cgi.ebay.com/Workman-Bandit-C...QQcmdZViewItem
BUt first...have you found out where the noise is coming in at? Pull the coax off the radio while the radio is on and the noise is presant. If the noise goes away....it's coming in through the antenna. Then you'd need an antenna noise filter. But....if the noise is still there...then it's coming through the power wire or ground wire. Ground wire should already be as short as possible. Same with the power. imo...i'd get power for the cb from a cigerette lighter or something inside the rig....no in the engine may. Routing of the coax makes a difference too....no looping it up to take away the excess.
http://cgi.ebay.com/Workman-Bandit-C...QQcmdZViewItem
BUt first...have you found out where the noise is coming in at? Pull the coax off the radio while the radio is on and the noise is presant. If the noise goes away....it's coming in through the antenna. Then you'd need an antenna noise filter. But....if the noise is still there...then it's coming through the power wire or ground wire. Ground wire should already be as short as possible. Same with the power. imo...i'd get power for the cb from a cigerette lighter or something inside the rig....no in the engine may. Routing of the coax makes a difference too....no looping it up to take away the excess.